Chelidonium majus, (commonly known as greater celandine or tetterwort, (although tetterwort also refers to Sanguinaria canadensis), nipplewort, or swallowwort,) is a herbaceous perennial plant, one of two species in the genus Chelidonium. It is native to Europe and western Asia and introduced widely in North America.

While the greater celandine belongs to the poppy family, the lesser celandine belongs to the buttercup family.